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Old 05-12-2010, 09:46 PM
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1966 Pontiac 389 Q-jet help?

I have a 1966 Pontiac Starchief two door hardtop, and it came with the 389 2 barrel engine with the 10.5 to 1 compression ratio. I am currently running that engine with an edelbrock performer intake and a quadrajet form a 76 suburban. I am wondering if anyone has any good specs on the Qjets to run on the 389 well, ( jet size, metering rods, secondary metering rods, etc.). Also if anyone is running a Pontiac 400 how are you running your quadrajets? I have tried a couple different jet and metering rod combinations, but am wondering what others have done and what has worked well for them. The engine still has the old points distributor and I am planning on putting in an HEI, so I want to install the HEI and then get my Q-jet dialed in and then put an electric choke on it. My engine is stock except for the edelbrock intake and headers. I am a newbie so I am just looking for the best way to setup my stock 389 and get the best performance I can out of it.

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Old 05-13-2010, 05:25 AM
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Quote:
Originally Posted by walrusmangrove
I have a 1966 Pontiac Starchief two door hardtop, and it came with the 389 2 barrel engine with the 10.5 to 1 compression ratio. I am currently running that engine with an edelbrock performer intake and a quadrajet form a 76 suburban. I am wondering if anyone has any good specs on the Qjets to run on the 389 well, ( jet size, metering rods, secondary metering rods, etc.). Also if anyone is running a Pontiac 400 how are you running your quadrajets? I have tried a couple different jet and metering rod combinations, but am wondering what others have done and what has worked well for them. The engine still has the old points distributor and I am planning on putting in an HEI, so I want to install the HEI and then get my Q-jet dialed in and then put an electric choke on it. My engine is stock except for the edelbrock intake and headers. I am a newbie so I am just looking for the best way to setup my stock 389 and get the best performance I can out of it.
Let the plugs tell you if the carb needs jetting changes. The Suburban Q-jet will be close on the primary side, the secondary side could be changed to a richer rod, say a "BD" for a start.

The power piston spring should also be rich enough for the 389, considering it's in a heavy car.

The air door spring may need to be adjusted to fine tune the secondary opening. Go in 1/8 turn increments and write the changes down as you make them- you'll never remember after the first couple times!
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